Improvement in steam-generators



DAVID REN-SQHAW.

M Improvement inSteam Generators. N 194 513 PatentedMarch12,l872.

DAVID RENSHAW, OF SYRACUSE, NEW YORK.

IMPROVEMENT IN STEAM=GENERATORS.

Specification forming part of Letters Patent No. 124,513, dated March12, 1872.

SPEOIFIGATION Of certain Improvements in Stean1Generators, invented byDAVID RENSHAW, of Syracuse, in the county of Onondaga and State of NewYork.

Nature and Object of the Invention.

Description of the Accompanying Drawing.

Figure l is a front view of my improved stean'i-generator, the front ofthe furnace at the right hand of the center being removed to give aclear view of the internal parts. Fig. 2 is a side elevation of theinternal parts and a section of the furnace.

General Description.

A is a reverberatory furnace, provided with two grates, B B, and theother necessary appliances common to steam-boiler furnaces. It is alsoprovided with a bridge or bridges, G, to support the tube, pipe, orcylinder D. This pipe 1) I prefer to cast in a single piece, withupwardly projecting portions to a, toreceive the vertical pipes E, ofwhich these projections a a really form a part. These pipes E I alsoprefer to cast in a single piece each, with the projections b b whichconnect with the semicircular pipes F, which last I also prefer to castin a single piece each. The pipes E are constructed to form jointsinside of the furnace at c, with downward projections cl from thesteamdrum G; or these joints may be made above the crown of the furnace,if in any case desired. In constructing the joints above mentioned, Iprefer to make them surface joints, secured by bolts in the usualmanner. The

steam-drum Gr may be made of either cast or wrought iron. If cast, Iprefer to cast the projections din a single piece with it, as represented in the drawing; andif the steam-drum G is made of wrought-iron,the projections 61 may be cast and bolted to it by means of the flanges,in the usual way practiced in such constructions. e e e are gauge-cocks,to regulate the height of the water in the boiler. The feedwater shouldbe supplied through one of the ends of the pipe I), and this pipe shouldbe provided with a removable head at one or both ends, for the purposeof cleaning the boiler, and these heads should belocated outside of thefurnace, so as to be conveniently accessible. For stationary boilers,the furnace A may be constructed of brick, in the form shown in thedrawing; or if desired, it may be made up of hollow iron sections,adapted to contain and evaporate water, and connected with thesteamdruin G, and with the feed-pipe by which water is supplied to theboiler. The grates B B are located one each side of the bridge 0, asshown, so as to allow this bridge to be built up directly from thefoundation, in the manner represented.

Remarks.

The construction and combination of parts herein described furnishes astrong and reliable steam-generator, with avery large evapcrating andtire surface within a small compass, while at the same time the fire isbrought to act in the most efficient manner in the generation of steam.This combination of parts also insures perfect circulation in theboiler, and a proper delivery of the steam generated to the steam-drum.The vertical pipes E being located in the middle of the furnace, and thecurved pipes F branching out from the said pipes E on both sides thereofand returning to them, in the manner described and in substantially theform represented inthe drawing, it will be seen' that the said pipes Fare thereby adapted to the arch of the furnace in such a manner as toutilize the heat to the best ad-' vantage, and at the same time toproduce a thorough and complete circulation of the water and a rapidgeneration of steam, while at the same time the boiler is made verycompact, and yet full and ample space for complete combustion is leftbetween the grates and the lower portions of the pipes F. As thetendency of any sediment in water will be to descend into the pipe D, itis obvious that this boiler can also be cleaned with very greatfacility. This may generally be done to efficient purpose under ordinarycircumstances by simply opening the blow-off cock, and allowing it toremain open for a short time while the feedpumps are working at theirfull capacity, so as to keep up the supply of water in the boiler andthis, it is obvious, can be done in this boiler without stopping theworking of the eugine, though the pressure of steam will be somewhatreduced, but not so much so as to prevent the performance of ordinary orlight work,-owing to the fact that in this boiler all the sediment isdelivered into the single tube or pipe D, where the mode of removing it,just above described, can be made available with the greatest possiblefacility by opening only one blow-off cock, there being no diversion ofcurrents to interfere with the direct tendency of the sediment to theblow-ofi' cock. In this combination of the pipe D, and vertical pipes Erising therefrom, and the curved pipes F branching out from the pipes Eand returning thereto, the sediment which forms in all the pipes is alldelivered in the single horizontal pipe D, from which it can be removedwith the utmost facility, as already stated, while at the same time thecombination of the pipes above mentioned in the manner described securesa perfect circulation in the boiler, (pipe 1) being exposed to thedirect heat of the fire,) which would not be realized from water legsextending upward from connections below the fire, even if provided withbranch-pipes. The pipes E being all placed upon a single central pipe,D, they can be placed very compactly together and still receive theefticient action of the heat of the fire upon all sides, While the pipesF, branching out therefrom toward the sides and crown of the furnace andreturning to the said pipes E,-are subjected to intense heat, causingvery rapid and complete upward circulation through them, while at thesame time this combination ot'parts makes the whole structure verycompact, so that a boiler of any given horse-power can be contained in afurnace of comparatively very small dimensions.

This combination, while affordingthe advantages above described, also atthe same time involvesthe further advantages that its sev ral parts canbe cast without any serious danger of fracture by contraction incooling, and the structure is perfectly free from danger of fracturefrom unequal expansion and contraction while in use; and also, that itaffords unusual facilities for repairs in case any should becomenecessary. The combination of the generating-tubes with a steam-drumplaced above the action of the fire is also important, as it affordssecurity from explosions caused by superheating of the steam, whichdanger is always present when steam is superheated in the same chamberin which it is formed.

Claim.

I claim as myinventiou- The combination of the reverberatory furnace A,the pipe D, the pipes E, the pipes F branching out from the pipes E andreturning thereto, and the steam-drum G, substantially as hereinbeforeset forth.

DAVID RENSHAW.

Witnesses:

Tnos. 1?. How, ANNA. M. N ARTHROP.

